Tsz Wo Nicholas Sze created HDFS-6685:
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             Summary: Archival Storage: Update Balancer to preserve storage 
type of replicas
                 Key: HDFS-6685
                 URL: https://issues.apache.org/jira/browse/HDFS-6685
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: balancer
            Reporter: Tsz Wo Nicholas Sze


In order to maintain storage policy requirement, Balancer always moves replicas 
from a storage with any type to another storage with the same type, i.e. it 
preserves storage type of replicas.  In this way, Balancer does not require to 
know storage policy information.



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